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2016-02-18T11:49:40+05:30

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Let a,b,c,d and e are five numbers
mean = (a +b+ c+ d+e)/5 = 30
 (a +b+ c+ d+e) = 150_______(1)
now, Let the number excluded be a
then, new mean =  (b+ c+ d+e)/4 = 28
 (b+ c+ d+e)= 112
putting this value in (1),
⇒a + 112 = 150
⇒a = 150 -112 = 38
∴ excluded number = 38

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